Concentrator.



STATES UNTE @lf ATi-NT Free.

CONCENTRATOR.

SPECIFICATION forming part of Letters Patent No. 698,737, dated April 29, 1902.

Application tiled December 27,1900. Serial No. 41,302. (No model.)

To all wtont it puny concerm.

Be it known that I, MARK D. ROCHFORD, a citizen of the United States, residing at Kingman, in the county of Mojave,.Territory of Arizona, have invented new and useful Improvements in Concentrators, of which theV following is a specification.

My invention relates to devices for separating valuable, heavy, and precious metals centrating-table and' the inclined extension B thereof, some of the parts being broken away for clearness of illustration. This table is approximately horizontal withfsufticient inclination downward toward the foo-t of the c table to allow the water to carry off the lighter portion of the material to be concentrated. On the table are two rows of transverselyfixed strips or riflies O of proper material eX- tending at right angles to the inclination of The purpose of providing rifies of this con-` struction is to expose the material to be separated to the different actions of the water as it runs over diiferent portions of these inclined riffles-that is to say, the water will exert the least effect on the material while opposite the center of the riffles, and that effect will increase as the material approaches the ends of the riiles until V,the ends of the riffles are reached. Between these rows of riiles is a partition-strip D', which divides the table into two parts A and A'. Along the outer edge of the part A of the table and forming the rim is another strip D. Lying adjacent to and along these strips are watersupply pipes E and E'. In these pipes, properly spaced apart, are openings e and so disposed on said pipes as to eject a small stream of water at the proper point upon the deflectors F and F' to properly separate the material carried onto these deliectors. Below these deflectors are the concentrate-troughs G and vG' for carrying off the concentrated product.

On the inclined extension of the table I affix a plurality of deflectors H, forming troughs.

IBy means of the lug-screws H', which adjustably screw these deflectors to the inclined extensions, the angle ot' these deflectors may be adjusted to suit the character of the material acted on and the How of the Water used in separating. 'lhese deliectors will spread the stream over the inclined extension and cause it to carry the lighter portion ofthe material to be separated farther along the ineline, while the heavier material will fall onto the deliectors lower down on the inclined plane, as shown hy the arrows, the course Aof the heavy material being shown bybroken arrows and the course of the lighter material being shown by full arrows, the purpose of which is to separate the material to be concentrated before it reaches the concentrating-table and deposit a different product on each portion ofthe table containing the riflies, and thereby greatly facilitate the work of concentration.

The material to be separated, mixed with a sufficient quantity of water for that purpose, will be fed to the inclined portion vB of the table in the direction and at the point indicated by the arrows at the top of the drawings and will pass down in the direction indicated by the arrows. The concentrator is provided with the well-known means (not shown) to impart the necessary intermittent motion thereto to properly assist in separating the material' fed therein by throwing the heavy portion laterally along the riiiies O and O,thro ugh the catches F and F', and into the troughs G and G'. As the material is fed to vthe table A from the inclined portion B the heavy particles will be deposited between the riiiies O, and by the movement of the table will be conveyed to the troughs G and G', while the Water, assisted by the inclination of the table, will carry the gangue or lighter material down and across the riffles to the foot of the table. To prevent as much as possible any portion of the gangue going into the troughs, I provide aseries of deliectors F and IOO F', shaped much like the moldboard of a plow, at the lower point of which a passage is provided from the table to the trough. To prevent as much as possible any gangue from passing into the troughs, I provide a series ofopenings ein the water-supply pipe,through which a jet or stream ot water will he ejected onto the moldboard portion of the fleflector, which will spread itself in an even flow over the concentrated product as it is conveyed through the deiiectors by theintermittent lnotion of the table. This will have a tendency to prevent the gangue or waste material from passing through into the concentratingtronghs and being discharged as concentrates.

Having described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. In a concentrator, the combination of a concentrating-table having along one side a concentratetrough and superposed watersupply pipe, and having along another portion a" line of riffles, extending transversely* and tapering in the direction et their length to form central portions of greater thickness than the ends whereby the material at the ends of the riftles is agitated with greater effect than the material at the thickened center, and a deliecting surface extending in line with the trough and below the Water-supply pipe, and rising from the table in a series of independent and gradual curves.

2. A concentrator-table having an inclined extension at oneend, to which the pulp is fed said extension having a series of detlectors said defiectors disposed substantially in line with the i'loor and having one portion fittedl to the extension and a second portion made trough -like and capable of spreading the stream over the extension and causing it to carry the lighter portion of material a greater distance along the inclined extension than the heavier portion.

3. The combination with an inclined concentrating-table, of a series of deflect-ors at the head end thereof said deflectors disposed substantially in line with the floor and having one portion fitted to the table and another portion made trough-like and extending in the direction of the iiow of pulp, and means whereby the deiiectors may be adjusted to different angles to suit the character of pulp acted on, and the flow of water.

4L. The combination in a concentrator-of a concentrating-table A; a series of rows of transversely-placed rilies ruiming from the head of the table to the foot thereof, the Said riftles being thick in the center and decreasing in thickness therefrom to the ends thereof a series of defiectors rising from the table in gradual curved lines, and extending from the head to the foot of the table; Water-supply pipes disposed above said deiiectors and having properlyspaced apertures thereon adapted to direct a jet of Water on the moldboard portion of the deflectors a concentratetrough below said pipe and adjacent to the deflectors to carry off'the concentrates.

5. The combination in a concentrator of a concentrating-table A, divided into two parts by the partition-rib D, extending centrally from the head tothe tail thereof; a row of transversely placed rifles on either side ot` said partition-rib 'extending from the head to the tail, thin at the ends and thick in the middle; deflectors F extending from the head to the tail, and rising above the table in gradual curved lines; water-snpplypipes D, disposed above said deectors and having discharge -apertures spaced apart, adapted to tending above the .table andcurved in the direction of their length.

In Witness that I claim the foregoing I have hereunto subscribed my name this 21st day of November, 1900.

MARK D. ROCIIFORD.

Witnesses:

G. E. HARPHAM, HENRY T. HAZARD. 

